Pump mechanism



. 30, 1929. s. WILTSE 1,711,298

PUMP MECHANISM Filed Feb. 6, 1928 2 Sheets-Sheet 1- fi my/er @2782 y zw April 30, 1929. s, w sE 1,711,298

PUMP MECHANISM Filed Feb. 6, 1928 2 Sheets-Sheet 2 jib/er [ii/fie Patented Apr. 30, 1929- UNITED STATES,

PATENT OFFICE.

SUMNER WIL'ISE, 011 DETROIT, MICHIGAN, ASSIGNOR T WILTSE 'APIPLIANCE (20., A

CORPORATION OF MICHIGAN.

' PUMP MECHANISM.

Application filed February 6, 1928. Serial No. 252,062.

.\This invention relates to pump mechanism v and particularly to a combined oil and fuel pump havin' a common driving means, the

principal object being the provision of a con-' struction wherein the fuel in the fuel pump and the passages leading to and from the same will not be materially affected by the temperature of the oil. t

Another object is the provision of a combined oil and fuel pump in which the oil pump portion may bepositioned in the lubricating oil in the oil pan of an internal com; bustion engine and the fuel pump portlon po sitioned exteriorly to the oil pan so as not to be affected by the temperature of, the oil.

Another object is to provide a pumping mechanism of the type above described which may be removed as a unit from the oil pan of an internal combustion engine without the necessity of removing the oil pan.

A further object is to provide an oil pan for an internal combustion engine having a (lepression in the lower face of the same, a fuel pump being secured to the oil pan within the depression and beingdriven by a member entending upwardly therefrom through the oil pan, the depression being of sufficient depth so'tha't the pump and its leads are not exposed below the effective bottom line of the oil pan.

The above being among the objects of the present invention the same consists in certain features of construction and combinations of parts to be hereinafter described with view taken transversely t rough an internal combustion engine.

Fig. 2 is a view taken on the line 22 of Fig. 1. J

Fig. 3 is a view taken on thelme 3-3 of Fig. 1.

Fig. 41s a view'similar to Fig. 1 and 11- lustratiiig a slightly modified form of construction.

Fig. 5 is a view taken on the line 5-5 of Fi 4. l v

The present invention is an improvement on the constructlon shown and claimed in my States for improvements in pumpin mechanism filed June 9th, 1927, and seria y numbered 197,753.

In the construction shown in that application a combined oil and fuel pump was provided which was positioned in the oil pan of an internal combustion engine, 'the fuel pump portion of the same being illustrated as submerged below the normal level of the lubricating oil within the oil pan and the, leads to and from the same extended for substantial distance within the oil pan, the purpose being to cause the fuel passing through the pump to be heated and thereby aid in the ultimate vaporization of the same. While the construction as illustrated in that application is of a material advantage in many instances I have found that in some instances the amount of heat'which is transmitted to the fuel from the oil and vapor within the oil pan and the crank case is suflicient to cause vaporization of the fuel in the fuel pump and in the passages connected thereto, with the result that at times fuel in the vapor state may be fed to the carburetor and thereby cause serious interference with the proper operation of the engine.

The present invention is designed to overcome the objections in my former application in those unusual instances where the fuel within the pump may absorb suflicient heat to vaporize the same.

One embodiment of the present invention may take "the form illustrated in Figs. 1 to 3 inclusive in the accompanying drawings in which 10illustrates the crank case of an internal combustion engine having a crank shaft 11 and cam shaft 12. A conventional oil pan 13 is secured by screws 14 to the lower face of the crank case 10. The crank case 10 is provided with a portion 15 which extends downwardly from the lower face of the same to a point adjacent but spaced from the bottom of the oil pan 13. The portion 15 is provided with a vertically extending opening 16 upper cover 21 and a lower cover 22-all secured together in assembled relationship by means of the bolts 23 and nuts 24. The upper cover 21 is provided with an upwardly projecting cylindrical extension 25 which is relatively closely but slidably received in the opening 26 formed in the bottom portion concentrically with the opening 16. The drive shaft 27 which extends vertically through the body and cover 21 is provided case being provided with a suitable opening permitting that portion of the pump above the flange 30 to extend therethrough. The body 20 of the pump is provided with an upper recess 32 and a lower recess 33, the recess 32 beingclosed by the upper cap 21 and the lower recess 33 being closed by the lower cap 22, the recesses 32 and 33 being cylindrical in horizontal section and eccentric to the axis of the shaft 27.

As illustrated in Fig. 2 the shaft 27 has sccured thereto within the recess 33 a rotor 34 provided with a transverse groove 35 in which a pair of outwardly spring pressed blades 36 are slidably received. The rotor 34 is of sufficient diameter as to be in constant sealing contact with the side walls of the recess 33 at one point. An outlet port 37 40 to the outlet pipe 41 and inlet pipe 42 respectively which may be connected to the carburetor of the engine and to a suitable source of fuel respectively.

In the upper recess 32 is received a rotor 43 similar to the rotor 34 and provided with spring pressed blades 44 of the same construction as the blades 36 previously described. The outlet port 45 for the recess 32 is connected by an outlet passage 46 which extends upwardly through the upper cap 21 and portion 25 to the interior of the opening 26 where it is further connected by the passage 47in the portion 15 and passages such as 48 to the various bearings of the engine. The inlet port 49 of the recess 32 is connected by the passage 50 to the exterior of the body 20 at a point where it is submerged in the oil within the oil pan 13. Thus, during operation of the engine theshaft 17 is caused to rotate which in turn rotates the shaft 27 and rotors 34 and 43, causing oil to be drawn into the upper recess 32 and forced through the passages 46, 47 and 48 to the bearingsof the engine, and at the same time fuel is drawn into the recess 33 through the pipe 42 and is discharged through the pipe 41 to the carburetor. A filtering screen member such as 51 secured at its upper end to a collar 52 slidably engaging the sides of the portion 15 extends of the various parts may be taken care of without effecting the operation of the mechanism in any manner whatsoever.

From the above it will be apparent that in the construction shown the oil pump is positioned within the oil pan and the fuel pump is positioned extcriorly of the oil pan, the two being formed into an integral unit driven by a common shaft and being removable from the oil pan and applicable thereto as a single unit. It'will also be apparent that in positioning the fuel pump portion and its passages exteriorly of the crank case it will be positioned in relatively cool air and so positioned with respect to the oil within the oil pan that very little, if any, heatwill be transmitted to the fuel from the oil. This will effectively prevent the transmission of sufficient heat to the fuel to cause vaporization of the same and consequent interference with the operation of the engine.

In Figs. 4 and 5 a slightly modified form of construction is shown. In these figures the flange 30, is eliminated from the body 20 and the upper cap 21 is sufiiciently enlarged in horizontal dimensions to take its place. The screws 31 in this case extend through the edges of the upper cap 21 and into the bottom of the oil pan which serves to support the device. The bottom of the oil pan in this:

case is provided with an upwardly extending depression 53 in which the umpin device is secured, the depression 53 eing 0 sufficient depth so that the device is completely received within the same and so that no part of it projects below the bottom of the oil pan where it 1 would form a projection which might catch obstructions which the vehicle in which the engine is carried may happen to pass over, thus protecting the device and its connections from possible injury. In this construction, inasmuch as the oil pump portion is positioned exterior to the oil pan, a modification of the inlet passage must be provided. This modification, as illustrated in Figs. 4 and 5, comprises the tube 54 which extends from a point adjacent the bottom of the oil pan to the upper wall of the recess 53 to which it is'se cured and where it is connected by a passage 56 is provided in this construction enclosingv the open end of the tube 54. The construction is otherwise identical to that shown in the first three figures of the drawings.

Formal changes may be made in the specific embodiment of the invention described without departing from the spirit or substance of the broad invention, the scope of which is commensurate with the appended.

claims.

WVhat I claim is:

1. In combination with an internal combustion engine, a combined oil and fuel pump supported from the oil pan thereof with that portion of the pump through which the fuel is adapted to pass positioned ex'teriorly of the oil pan, and means extending into said oil pan for driving said pump.

2. In combination with the oil pan of an internal combustion engine, a casing enclosing a fuel pump and an oil pump, means for securing said casing to said oil pan with said fuel pump exterior to said oil pan, and means extending into said oil pan for driving said pumps.

3. In combination with an internal combustion engine, an oil pump and a fuel pump provided with a common casing, means for supporting said casing on a Wall of said engine with the fuel pump portion thereof exposed on the exterior of said wall, and means on the inner side of said wall for driving said pumps.

4. In combination with an internal combustion engine, an oil pump and a fuel pump provided with a common casing, said casing pro,- jecting through a wall of said engine and being secured thereto with the fuel pump positioned exteriorly of said wall, and common means for driving said umps.

5. In combination with t e oil pan of an internal combustion engine, an oil pump and a fuel pump provided with a common casing and a common driving means, said casing projecting throu h said oil pan and being se cured thereto wit said fuel pump exterior to said oil pan, and means within said oil pan for driving said pumps.

6. In combination with the oil pan of an internal combustion engine, an oil pump and a fuel pump provided with a common casing, a guiding member in said oil pan, said oil pan being provided with an opening in line with said member, a part on said casing extending through said opening and being located by said guiding part, and a driving connection for said pumps within said oil pan.

7. In combination with the oil pan of an internal combustion engine, an oil pump and a fuel pump provided with acommon casing, and means for securingsaid casing to said oil pan with the oil pump'portion thereof submerged in the oil within said oil pan and the fuel pump portion thereof positioned exteriorly of said oil pan.

8. In combination with the oil pan of an internal combustion engine, a recess formed in the bottom of said oil pan, and a fuel pump positioned in said recess.

9. In combination with the oil pan of an internal combustion engine, a recess formed in-the bottom of said oil pan, a fuel pump substantially enclosed by said recess, and means for driving said fuel pump extending through said oil pan.

10. In combination with the oil pan of an internal combustion engine, a recess formed in the bottom face of said oil pan, a fuel pump secured to said oil pan within said recess, and means for driving said pump extending through said oil pan, the depth of said recess being greater than the depth of said pump below the upper wall of said recess.

11. In combination with the oil pan of an internal combustion engine, a recess formed in said oil pan, an oil pump and-a fuel pump provided with a common casing, said casing being positioned within said recess and projecting through said oil pan, and means extending into said oil pan for driving said pumps.

SUMNER WILTSE. 

